Machine for debonding brake shoes



Feb. 5, 1957 A. o. WISTI MACHINE FOR DEBONDING BRAKE SHOES 2 Shets-Sheet 1 Filed July 19, 19 54 Feb. 5, 1957 A. o. WISTI ,780,

MACHINE FOR DEBONDING BRAKE SHOES Filed July 19, 1954 2 Sheets-Sheet 2 INVENTOR.

ANDREW 0. M571.

4770 R/VEY throughout the several views and in which:

. a frame 10.

2,?30,Z84 Patented Feb. 5, 1957 2,780,284 I r MACHINE FOR DEBONDiNG BRAKE sHoEs Andrew Wisti, Minneapdlis, Minn.

Application July 19, 1954, Serial No. 444,031 4Claims. Ci. 164-39) ing adhesive or partial welding. The present machine is for separating the lining from the metal portion of the shoe to which the lining is bonded.

It is an object of this invention to provide a very simple and efiicient machine which will operate to separate the lining from the shoe very rapidly. v

It is a further object of the invention to provide a machine for debonding brake shoes comprisingalower roller having a roughened periphery for engagingthe outer side of the lining, an upper roller preferably of much larger diameter than said lower roller, engaging the inner side of the brake shoe, together with a knife having a cutting edge directed between said rollers against which the lining is moved for severing the same from the metal portion of the shoe, a guiding means being used for ma'intaining the shoe in position as it moves against said knife.

It is also an object of this invention to provide suchja machineas set forth inthe above paragraph, said machine also having means for holding said knife in cutting posi tion and for lowering the edgeof said knife. v

It is another oo ect of the invention to provide such a machine as set forth in 'the' previous paragraph save one, together with power means for rotatin'gs'aid rollers, and a manually operated means for rotating said rollers.

It isst'ill another object of this invention to 'p r ovide a machine'for debonding brake shoes comprising a lowe'r rotatable IfQilGi fOI engaging the outer side of thelini'ng, said roller being resiliently mounted, an upper roller engaging the" inner side of the shoe; said upper roller upper ends which extend toward each other. I Said frame also has other bosses or hubs 10d below the bosses or pussies on plates 10b which also extend toward each other. A shaft 13 is journaled in bosses 10c and has secured thereto centrally between said bosses a pair of wheels lithe same being secured to shaft 13 by keys 16 and set screws 17. Wheels 14 have reduced portions 14a on their adjacent sides. By loosening set screws 17, wheels 14 can be moved and positioned to suit different widths of brake shoes. The peripheries of wheels 'le are roughened and while this might be done in various ways, in the embodiment of the invention illustrated, said peripheries 'are provided with a multiplicity of segment-like c'o'rrugations.v Shaft 13 has secured thereto at the outer side of one merhber-liib, a gear 18. A pinion 19'meshes with "gear 18 and is secured to a shaft 20 journaled in bearings 41b in a bracket 41 to be later described. A "gear finis secured to pinion 19 and a pinion 23 meshes with ge'ar 22. Pinion 23 is secured to a shaft 24 journn'e'd iii-bearings 'l tie formed in one side of frame members'TOZi Shaft 24 has secured thereto a gear 26 with which rnes hes a pinion '27. A pulley 30 and pinion 27 rotate on shaft 20 and pulley 30, is driven by a belt, 31 from a motor 32 having a base plate 32a secured by bolts 33 to a shelf 34$ 311'ied in the table or frame 11.: Motor 32 is disposed in the casing 11, which casinghasa door '1f1a at one side thereof swingableabouthinges 35. Belt 31 passesthrough openings in the top of frame or casing Pinion 27 is secured to and rotates with pulley 3i). Aihand wheel 28 is carried on the end portion of shaftzt) ah' d has a hub with a diametral slot 28a therein. .Hand wheel 28,1canbe moved so that apin 29 secured in shaft 23) is disposed in jthe slot 28a and hand wheel 28 is thus secured to shaftlii. g v p I lower roller 33 is, provided secured to shaft 20. Roller 38 has a roughened periphery which .is shown as by aplurality of segment-like corrugations. Shaft 29 is journaled in bearings 41c in'one end of a bracket mounted to, swing about shaft 24. Bracket 41has a plate-like portion 41a at its upper side to which is secured a guiding member 42 for guiding the shoe 44 between the wheels'l4 and 38. Member iz is provided withia plurality of holes spaced longitudinally thereof in which pins '45, can be variously positioned so that member 42 canibe held in different positions or different members 42 used. Bracket 41 also has a plate-like portion 4112 at its rounds a cylindrical projection 50 .upstanding from and having afixed axis, a knife having a transversely ext'ending'ed' e directed between said rollers against which the shoe is' moved, a. guiding means for guiding the shoe between said rollers and a discharge chutefor the lining removed from said shoe.

These and other objects and advantages of the i-nvention willibe fully set forth in the following description made in connection with the accompanying drawings -ln whichlike reference characters refer to similar parts Fig. 1 is aview in side elevation of the machinelof this invention; v Fig. 2 is averti cal section taken substantially on line 22ofFig.4; r

Fig. 3 is a 'view in front elevation of said machine; and Fig. 4 is a view in rear elevation of said machine. F Referring to the drawings, a machineis' shown having as attached to a table-like frame or casing 11 by spa'ce'd headed bolts 12. Said frame has upstanding: parallel plate-like portions 10b having bosses or hubs 100 at their Frame 15! has a base plate 101i illustrated secured in base'plate 10a. One member 1% has a boss impress-nag therefrom in which is threadeda screw 51, the same having a slot 51a in its upper end for receiving a ftool forturning said screw. The lower end of screw 51 engages one side of bracket 41 and determines the tipper posit-ion of roller 38. A lock nut 53 in screw 51 155 underlielthe heads of bolts 55. .Knife 52 hasslots 52a therein through which bolts ,55 pass so that knife '52 cai1 be:.moved. longitudinally for proper adjustment. Slots 52a extend through the end of knife 52. Member 54 has cylindricalportions 54a journaled in bosses I'M. A cot- A stop member or plate66 is secured to one side and has its other end extending around one end of rod 62. Spring 64 urges knife 52 against eccentric 62a. A handle 66 is secured to one end of member 62. A stop pin 67 for handle66 is secured in the frame 10. A discharge chute 70 for the separated brake linings extends downwardly from between frame portions 1%. A switch box 72 is shown from which projects a switch handle 73 for operating the switch for motor 32. A housing 74 is preferably used to cover the gears for driving rollers 14 and 38.

In operation, motor 32 will be operated and this will drive pulley 30 and pinion 27. As stated pinion 27 and pulley 30 rotate on shaft 20 and pinion 27 will drive gear 26. Gear 26, as shown in Fig. 2, is secured to shaft 24. Pinion 23 moves with gear 26 and this drives gear 22 journaled on shaft 20. Pinion 19 moves with gear 22 and drives gear 18 secured to shaft 13. Lower roller 38 is rotated by pinion 19 and upper roller 14 is rotated by gear 18. It will be noted that there is a very high gear ratio between pulley 30 and gear 18. The ratio from the shaft of motor 32 to gear 18 is approximately 300 to one. Great power is thus applied to rollers 14 and 38. The knife 52 i normally held in its lower position by spring 64 and said knife bears against eccentric portion 62a. Knife 52 also abuts against member 60 preventing any longitudinal movement of said knife. When lever 66 is in the full line position shown in Fig. l, eccentric portion 62a is in position with the short radius thereof engaging the underside of knife 52 so that said knife is in its lower position. The metal portion or portion of hard material 44a of the shoe 44 usually projects some distance beyond the lining portion 44b. The operator will turn the motor switch 72 to stop the motor temporarily. The shoe will then be placed in the guiding member 42 and wheels 38 and 14 will be turned by turning hand wheel 28. Said hand wheel will then be connected to the shaft 20 by pin 29. The shoe can then be moved a short distance between rollers 38 and 14. The roughened peripheries of these rollers grip the shoe and move the same positively. When the projecting part of the shoe is above the knife edge, the operator will then swing lever 66 downwardly and knife 52 will then be moved upwardly by eccentric portion 62a and its edge will be brought very firmly against the bottom of the metal or hard portion of the shoe. Hand wheel 28 can then be disengaged and the motor switch 72 again thrown to start the motor. The shoe i then moved by rollers 38 and 14 and is moved against the knife 52 which moves between the lining 44b and the metal portion 44a of the shoe and separates or cuts the lining from the metal portion 441:. The lining passes downwardly in the chute 70 and the metal portion 44a moves around with roller 14 so that the operator can take hold of the same and lay it aside. An experienced operator will not have to use the lever 66 for each shoe but will soon acquire sufiicient skill to have the knife 52 in the correct position. It will be seen that lower roller 38 is yieldingly mounted since bracket 41 can move and move the screw 46 against spring 50. The tension on spring 48 can be adjusted by turning screw 46. The movement of bracket 41 and hence of lower roller 38 is comparatively small so that gears 19 and 18 do not get out of mesh. It is also pointed out that by having the lower wheel 38 of small diameter greater power can be exerted on the brake shoe, and byhaving the upper wheels of considerably larger diameter they will engage a greater portion of the surface of the brake shoe and assist in moving the same and hold ing it firmly under'control.

From ,the above description it will be seen that I have produced a machine by means of which the brake shoes can be easily and very quickly debonded. An average -workman without much experience can debond a complete set of eight brake shoesin less than two minutes. The machine will handle shoes of various sizes and widths. The machine 1s very rugged in structure and designed to stand the great strain placed upon it. The part are conveniently housed and the machine has an attractive appearance and takes up little space on the factory floor. The machine has been amply demonstrated in actual practice, found to be very successful and efficient and is being commercially marketed.

It will of course be understood that various changes may be made in the form, details, arrangement and pro portions of the parts, without departing from the scope of applicants invention, which, generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is:

1. A machine for debonding brake shoes having in co1nbination, a lower rotatable wheel, a pair of upper rotatable laterally spaced wheels of considerably larger diameter than said wheel, said upper wheels being disposed to engage the inner side of a bonded brake shoe, said lower wheel engaging the outer side of the lining of said shoe,

a guiding member having laterally spaced walls substantially engaging the sides of said shoe for guiding said shoe to said wheels, and a knife fixed in position and disposed at the side of said rollers opposite said guiding member having an edge parallel to the exterior surface of said shoe, said shoe being moved toward said knife by said rollers for separating the lining from the metal shoe.

2. A machine for debonding brake shoes, which shoes have a hard part with a lining bonded thereto, having in combination, a lower rotatable wheel, an upper rotatable means comprising wheels of considerably larger diameter than said wheel, said upper wheels being spaced for en gaging the inner side of a bonded brake shoe, said lower wheel engaging the outer side of the lining of said shoe, a guiding member having laterally spaced walls Substantially engaging the sides of said shoe for guiding said shoe, a knife disposed in fixed position at the side of said rollers opposite said guiding member, means for pressing the edge of said knife against the hard part of said shoe, said shoe being moved toward said knife by said rollers for separating the lining from the metal shoe.

3. A machine for debonding brake shoes having in combination, a lower rotatable wheel, a pair of upper rotatable laterally spaced wheels of considerably larger diameter than said wheel adapted to engage the convex side of said shoe, said lower wheel engaging the outer side of the lining of said shoe, a knife having an edge closely adjacent one side of said rollers and extending transversely parallel to the peripheries of said rollers, a member to which one end of said knife is secured rotatable about an axis parallel to said edge, an eccentric below said knife having a periphery engaging the lower side of said knife and means for rotating said eccentric to move said knife to fixed operative position and to permit said knife to move away from said position.

4. A machine for debonding metal brake shoes, which shoes have an arcuate flange with a central rib on their concave sides and a lining bonded to the outer convex sides of said flange, said flange having a projecting portion at its end extending some distance beyond said lining, having in combination, an upper roller having laterally spaced parts engaging the concave side portions of "said flange ateach side of said rib respectively, a lower roller spaced from and cooperating with said roller, said roller being driven to receive a loose shoe and move it between the same, a knife having a rectilinear edge extending transversely of said flange, said knife being movable to an inoperative static-nary position spaced from said flange and to a stationary operative position with said edge against said projecting portion of said flange, a manual means for rotating said rollers having operative and inoperative conditions, and a power means including a motor for driving said rollers, whereby said shoe can be placed between said rollers and the latter rotated by said manual means when in operative condition until said shoe is progressed beyond said rollers, said knife then being moved to bring its edge against said projecting portion of said flange, said manual means placed in inoperative condition and said motor then started to move said shoe by said power means against said stationary knife edge, said edge being disposed between the latter.

References Cited in the file of this patent UNITED STATES PATENTS M'orrell Ian. 23, 1872 Moore May 11, 1875 Frost June 5, 1888 Hill Feb. 3, 1925 Kimmerling Dec. 20, 1927 Weber Apr. 7, 1936 Johnson July 8, 1947 Urbano Jan. 22, 1952 Barrett May 25, 1954 FOREIGN PATENTS Austria Nov. 10, 1932 

